现代肺结核短程化疗治愈率可达95％以上，复发率仅1％～2％。但化疗失败而成为慢性传染源者却不鲜见。为了探讨慢性传染源的成因，从中总结防治工作的教训，更好地开展防宏工作。我们对1988～1994年登记的肺结核病例中持续排苗达2年以上者进行调查分析，结果报告如下。一、资料 Modern tuberculosis short-course chemotherapy cure rate of up to 95%, the recurrence rate of only 1% to 2%. However, it is not uncommon for chemotherapy to fail to become a chronic source of infection. In order to explore the causes of chronic infection sources, summing up the lessons learned from prevention and control work to better carry out anti-macro work. We conducted a survey and analysis of the cases of persistent tuberculosis in tuberculosis cases registered for 1988 to 1994 for more than two years. The results are reported as follows. First, the information